Contained in Brettspiel Adventskalender 2016 for Day 3
Each player receives a volcano tile
After initial placement of adventurers and temples, the youngest player starts and sets their volacano on one of their 12 jungle fields in the interior of their island (not on an edge field)
Continue clockwise except every player has to pick a different field on their island for their volcano
Volcano tiles do not have a path and cannot be accessed by adventurers.
Whenever an adventurer moves to a tile that is horizontally or vertically (not diagonally) next to a volcano tile, he has to pay 2 movement points instead of one.
For more information, visit the BGG listing.